Apple also announced that iPad owners have downloaded more than 1.5 million ebooks from iBookstore, and more than 12 million apps. There are already more than 5000 iPad-specific apps developed, although the iPad can also run most of the 200,000 applications that are available for iPhone and iPod touch.

Based on iPhone OS, the iPad is available in two versions: a Wi-Fi one (starting at $499), and a Wi-Fi + 3G one (starting at $629).

By now, it’s obvious that the iPad is a commercial success – so we shouldn’t be surprised if Apple also launches that rumored mini iPad next year.